---
product_id: 148907055
title: "Sterile Manure Substrate"
brand: "north spore"
price: "956 kr"
currency: DKK
in_stock: null
reviews_count: 8
category: "North Spore"
url: https://www.desertcart.dk/products/148907055-sterile-manure-substrate
store_origin: DK
region: Denmark
---

# 5 lb premium sterile substrate Optimized for max mushroom yield Proudly made in USA Sterile Manure Substrate

**Brand:** north spore
**Price:** 956 kr
**Availability:** ❌ Out of Stock

## Summary

> 🍄 Grow like a pro, harvest like a legend!

## Quick Answers

- **What is this?** Sterile Manure Substrate by north spore
- **How much does it cost?** 956 kr with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.dk](https://www.desertcart.dk/products/148907055-sterile-manure-substrate)

## Best For

- north spore enthusiasts

## Why This Product

- Trusted north spore brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **No-Fridge Storage:** Convenient room temperature storage with a long shelf life, so you’re always ready to grow when inspiration strikes.
- • **Boost Your Harvest:** Scientifically formulated manure blend designed by expert mycologists to maximize mushroom growth and yield.
- • **Trusted by the Pros:** Years of refinement and wide adoption by dung-loving mushroom growers guarantee reliable, consistent results.
- • **Versatile Growing Options:** Perfect for monotubs, filter bags, outdoor beds, or direct bag/tray growing in controlled environments.
- • **Ready-to-Use Sterile Substrate:** Hydrated to field capacity and sterile, ensuring a contamination-free start for your mushroom cultivation.

## Overview

The Boomr Bag is a 5-pound sterile, manure-based bulk substrate expertly crafted in the USA to boost yields of dung-loving mushrooms. Hydrated and ready to use, it supports versatile growing methods and is trusted by mushroom cultivators for its premium composted horse manure blend and contamination-resistant formula.

## Description

North Spore was launched in 2014 by a mycologist, an organic farmer, and a photojournalist -- three college friends brought together through their shared love of the mycological world. North Spore provides everything one needs to grow mushrooms, from the beginner to the expert. From Spray & Grow Kits to growing chambers, sterile substrates, lab supplies, and more. We also offer medicinals made with the highest quality fruiting body extracts. North Spore was launched in 2014 by a mycologist, an organic farmer, and a photojournalist -- three college friends brought together through their shared love of the mycological world. North Spore provides everything one needs to grow mushrooms, from the beginner to the expert. From Spray & Grow Kits to growing chambers, sterile substrates, lab supplies, and more. We also offer medicinals made with the highest quality fruiting body extracts. Substrates & Grow Bags Visit the Store Substrates & Grow Bags Visit the Store Monotubs & Accessories Visit the Store Monotubs & Accessories Mycology Lab Supplies Visit the Store Mycology Lab Supplies Mushroom Spray & Grow Kits Visit the Store Mushroom Spray & Grow Kits Plugs & Log Kits Visit the Store Plugs & Log Kits Wellness Supplements Visit the Store Wellness Supplements

Review: It works - Good stuff all I use
Review: A little pricey, but worth it! - I got some chonky mushrooms with my Boomr Bag. If you're a newbie, just know that you have to germinate your spores in an agar plate, or BRF jar first.

## Features

- INCREASE YOUR YIELD: Our best-selling Boomr Bag is a sterile manure-based bulk mushroom substrate formulated by mycologists to increase the yield of your grow.
- PREMIUM MANURE BLEND: It features a proprietary blend of composted horse manure, coco coir, and several quality substrate supplements (although we keep the exact blend a secret!)
- TRUSTED BY GROWERS: Over several years, Boomr Bag has been perfected for dung-loving mushroom species and is widely-trusted by mushroom growers. Note: Substrate is hydrated to field capacity.
- FOR EVERY TYPE OF GROWER: Use Boomr Bag in monotubs, filter bags, and outdoor beds. Or, grow mushrooms from the bag or tray in a humidity-controlled grow room or Martha set up.
- SPAWN TO BULK RATIO: We recommended mixing 1 colonized grain spawn bag with 2-3 Boomr Bags. (Higher inoculation rates may improve your success.)
- STORAGE: Boomr Bags should be stored at room temperature out of direct sunlight. No refrigeration is necessary. They can also be stored for several months before use.
- BEST PRACTICES: We recommend clean hands, latex or nitrile gloves, and sterile technique when using Boomr Bag to reduce the introduction of contaminants. It is also best practice to wait a minimum of 1 week after arrival before using sterile substrates to ensure they were not compromised during transit.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B07TTV73RM |
| Best Sellers Rank | #18,019 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #300 in Garden Soil |
| Customer Reviews | 4.2 4.2 out of 5 stars (1,195) |
| Item Weight | 5 pounds |
| Manufacturer | North Spore |
| Product Dimensions | 8 x 5 x 5 inches |

## Product Details

- **Brand:** North Spore
- **Global Trade Identification Number:** 00851555008931
- **Item Weight:** 5 Pounds
- **Style:** Sterile substrate
- **UPC:** 851555008931

## Images

![Sterile Manure Substrate - Image 1](https://m.media-amazon.com/images/I/71UZ-9FQZGL.jpg)

## Questions & Answers

**Q: how long can the substrate last in the bag?**
A: Not long mine was green when it arrived.

**Q: Do I just need this kit and a spore syringe to grow or would I need something different or additional?**
A: You would want something like rye berries or straw depending on the mushroom. To inoculate with a spore syringe to colonize then mix in this substrate but if you have myceilium already colonized you would just mix it into this substrate. You wouldn't want to just inject this with spores, from my understanding.

**Q: How long will this product last before use when stored properly? And what would be recommended storage if possible?**
A: The sooner you use it, the better. Because it's a sterilized substrate, it will probably be fine for 6 months to a year. I'd keep it in a cool dry place. This is a good option and I've been pleased with the product.

**Q: Where do I acquire a rye, vermiculite, pearlite substrate?  Thanks**
A: amazon, home depot, hydroponic store...... but if you are planning to add it to this substrate you would need to sterilize it.  This bag is made to be used without adding anything to it

## Customer Reviews

### ⭐⭐⭐⭐⭐ It works
*by N***K on February 11, 2026*

Good stuff all I use

### ⭐⭐⭐⭐⭐ A little pricey, but worth it!
*by C***S on December 14, 2025*

I got some chonky mushrooms with my Boomr Bag. If you're a newbie, just know that you have to germinate your spores in an agar plate, or BRF jar first.

### ⭐⭐⭐⭐⭐ Best pre-pasteurized substrate I've found.
*by T***E on January 21, 2023*

I switched to boomr bags after being unsatisfied with other pre-pasteurized substrates and mixing and sterilizing my own. It's not cheap, but the end result is superior. Keep bag for at least a week before using to check for contam. North Spore will replace for free any contaminated bags if you contact them. I've never seen a contaminated bag even after over 20 orders, but I have had to get north spore to replace a grain bag which they did hassle-free. Just take a pic of the contaminated and the lot number sticker on bag and email them. For anyone saying this substrate doesn't work for manure lovers, I'd say you just don't know how to grow mushrooms. A lot of people contaminate batches themselves without realizing it. The bag may come too wet or dry. Too dry, just spray with distilled water during mixing with spawn in sterilized room. Too wet (you can tell if water separates from substrate and you can see liquid in bag) let it dry out by spraying breather patch with alcohol and unfolding bag a little and let sit a few days. Always spray breather port with alcohol before handling or moving it from box. Airborne bacteria can get pulled into bag from patch.

## Frequently Bought Together

- ‘Boomr Bag’ (5 lb) Manure-Based Sterile Mushroom Bulk Substrate | Maximum Yield Formula | Made in USA | Grow Dung-Loving Mushrooms | North Spore
- North Spore Organic Sterilized Hydrated Grain Bag w/Self-Healing Injection Port | Sterile Mushroom Spawn Bags w/ 0.2 Micron Filter Patch | USDA Certified Organic (1 Pack)
- Myco Labs Premium 5-Grain Mushroom Spawn Bags | Sterilized Grain Spawn | Injection Ports | 2 Quarts Each Bag | 2 Bags per Box

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*Product available on Desertcart Denmark*
*Store origin: DK*
*Last updated: 2026-03-05*